ToolsFaction Utility
IP & Subnet Calculator
Inspect an IPv4 subnet from a single CIDR value.
Calculate IPv4 network, subnet mask, broadcast, host range and address counts from CIDR notation.
About This Tool
ToolsFaction IP & Subnet Calculator converts an IPv4 address and CIDR prefix into practical subnet details including the network address, subnet mask, broadcast address, host range and address counts.
How to Use
- Enter an IPv4 address followed by a CIDR prefix.
- Select Calculate.
- Review network, mask and broadcast values.
- Use the host range and counts for network planning.
Example
Enter 192.168.1.25/24 to calculate the surrounding IPv4 subnet.
Frequently Asked Questions
Does this support IPv6?
This calculator is focused on IPv4 CIDR networks.
What is CIDR?
CIDR notation combines an IP address with a prefix length such as /24.
What are usable hosts?
For traditional IPv4 subnets up to /30, the calculator excludes network and broadcast addresses from the usable count.
Does it send network traffic?
No. It performs local address calculations only.
Free to UseNo hidden fees
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Browser-BasedNothing to install
Privacy FriendlyBuilt for simple use